🟠 High   ⏱ 5–30 min  Last verified: 19 May 2026
Affected versions: FreeBSD 12

📖 ~1 min read

Table of contents
  1. Symptom & Impact
  2. Environment & Reproduction
  3. Root Cause Analysis
  4. Quick Triage
  5. Step-by-Step Diagnosis
  6. Solution – Primary Fix
  7. Solution – Alternative Approaches
  8. Verification & Acceptance Criteria
  9. Rollback Plan
  10. Prevention & Hardening
  11. Related Errors & Cross-Refs
  12. References & Further Reading

Symptom & Impact

Applications report stale file handle and lose access to NFS-backed data paths.

Environment & Reproduction

Often triggered after server export changes or failover events.

mount -t nfs
nfsstat -c

Root Cause Analysis

Client references server-side file handles that changed after export or inode transitions.

Quick Triage

Identify affected mounts and active file users before remounting.

fstat | grep 
showmount -e

Step-by-Step Diagnosis

Inspect mount options and kernel messages for NFS transport errors.

tail -n 200 /var/log/messages | grep -i nfs
cat /etc/fstab | grep nfs
Illustrative mockup for freebsd-12 — nfs_stale_handle
NFS stale handle errors — Illustrative mockup — Progressive Robot

Solution – Primary Fix

Unmount stale mount and remount with validated NFS version/options.

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umount -f /mnt/share
mount -t nfs -o nfsv4,tcp :/export /mnt/share
Illustrative mockup for freebsd-12 — nfs_stable_mount
NFS mount stable after fix — Illustrative mockup — Progressive Robot

Solution – Alternative Approaches

Use automount maps to reduce stale mount lifetimes under changing exports.

Verification & Acceptance Criteria

Read/write checks succeed without stale handle or transport endpoint errors.

touch /mnt/share/.healthcheck
rm -f /mnt/share/.healthcheck

Rollback Plan

Reapply previous mount options if compatibility or lock semantics degrade.

Prevention & Hardening

Coordinate export changes with client remount windows and health checks.

Stale NFS file handle, RPC timeout, transport endpoint errors.

Related tutorial: View the step-by-step tutorial for freebsd-12.

View all freebsd-12 tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

nfs(5), mount_nfs(8), and FreeBSD network filesystem tuning docs.

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